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Unformatted text preview: Chemical Adsorption and Desorption Introduction Components of Soils and Sediments Surface Sorption of Ions Surface Sorption of Neutral Organics The Sorption Process The Role of Organic Carbon Summary and Conclusions I. Introduction Why do some hydrocarbons leach with water percolation while others are retained in the upper soil layer? BTEX Low water solubility (&lt;1 ppm) MTBE High water solubility (~43000 ppm) II. Components of Soils and Sediments Minerals (no carbon) iron-oxides, silicates and aluminates Organic matter (carbon) carbon-based matter (humus) 1. 2. A Typical Soil Mineral fraction in imperfect spherical shapes Mineral particulates surrounded by water and an organic phase Fundamental Definitions Adsorption (or sorption): attachment of a solute to a solid surface once sorbed, it becomes a sorbate Desorption: release of a sorbate from a solid surface once desorbed, it becomes a solute. An equilibrium process Ad sorption and ab sorption are not the same. How do they differ?...
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